<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
    <meta charset="UTF-8">
    <title>发现一个问题 o(╯□╰)o - HacPai</title>
    <link rel="icon" type="image/png" href="/theme/images/logo@48.png"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"/>
    <style>
        html {
            height: 100%;
        }

        body {
            font-family: "Helvetica Neue", "Luxi Sans", "DejaVu Sans", Tahoma, "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
            background: #3b3e43;
            color: #bbb;
            font-size: 18px;
            line-height: 1.6;
            margin: 0;
        }

        a {
            color: #e6e6e6;
        }

        .body--ready {
            background: -webkit-linear-gradient(top, #666 0%, #3b3e43 120%);
            background: -moz-linear-gradient(top, #666 0%, #3b3e43 120%);
            background: -o-linear-gradient(top, #666 0%, #3b3e43 120%);
            background: -ms-linear-gradient(top, #666 0%, #3b3e43 120%);
            background: linear-gradient(top, #666 0%, #3b3e43 120%);
        }

        .text {
            position: fixed;
            bottom: 20px;
            text-align: center;
            width: 100%;
        }

        .canvas {
            margin: 0 auto;
            display: block;
        }

        .slogan {
            position: fixed;
            bottom: 50%;
            text-align: center;
            width: 100%;
            font-size: 60px;
            color: #FFF;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
            display: none;
        }
    </style>
</head>

<body class="body--ready">
<canvas class="canvas"></canvas>
<p class="slogan">Pipe</p>
<p class="text">
    加载出现了点问题，请稍后尝试刷新<br/>
    如果还不能使用，<a target="_blank"
               href="http://shang.qq.com/wpa/qunwpa?idkey=981d9282616274abb1752336e21b8036828f715a1c4d0628adcf208f2fd54f3a">联系我们</a>吧！
    <br>
    <a href="https://github.com/88250/pipe">GitHub</a> &nbsp;
    <a href="https://b3log.org/">B3log</a>
</p>
<script>
  var S = {
    init: function () {
      S.Drawing.init('.canvas');
      document.body.classList.add('body--ready');
      var text = 'B3log|Solo|Pipe|Symphony|Wide|with YOU!|#countdown 3|#icon thumbs-up';
      if (window.innerWidth < 600) {
        text = 'P|i|p|e|';
      }
      S.UI.simulate(text);
      S.Drawing.loop(function () {
        S.Shape.render();
      });
    }
  };


  S.Drawing = (function () {
    var canvas,
      context,
      renderFn,
      requestFrame = window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function (callback) {
          window.setTimeout(callback, 1000 / 60);
        };

    return {
      init: function (el) {
        canvas = document.querySelector(el);
        context = canvas.getContext('2d');
        this.adjustCanvas();

        window.addEventListener('resize', function (e) {
          S.Drawing.adjustCanvas();
        });
      },
      loop: function (fn) {
        renderFn = !renderFn ? fn : renderFn;
        this.clearFrame();
        renderFn();
        requestFrame.call(window, this.loop.bind(this));
      },
      adjustCanvas: function () {
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
      },
      clearFrame: function () {
        context.clearRect(0, 0, canvas.width, canvas.height);
      },
      getArea: function () {
        return {w: canvas.width, h: canvas.height};
      },
      drawCircle: function (p, c) {
        context.fillStyle = c.render();
        context.beginPath();
        context.arc(p.x, p.y, p.z, 0, 2 * Math.PI, true);
        context.closePath();
        context.fill();
      }
    };
  }());


  S.UI = (function () {
    var interval,
      currentAction,
      time,
      maxShapeSize = 30,
      sequence = [],
      cmd = '#';

    function formatTime(date) {
      var h = date.getHours(),
        m = date.getMinutes(),
        m = m < 10 ? '0' + m : m;
      return h + ':' + m;
    }

    function getValue(value) {
      return value && value.split(' ')[1];
    }

    function getAction(value) {
      value = value && value.split(' ')[0];
      return value && value[0] === cmd && value.substring(1);
    }

    function timedAction(fn, delay, max, reverse) {
      clearInterval(interval);
      currentAction = reverse ? max : 1;
      fn(currentAction);

      if (!max || (!reverse && currentAction < max) || (reverse && currentAction > 0)) {
        interval = setInterval(function () {
          currentAction = reverse ? currentAction - 1 : currentAction + 1;
          fn(currentAction);

          if ((!reverse && max && currentAction === max) || (reverse && currentAction === 0)) {
            clearInterval(interval);
          }
        }, delay);
      }
    }

    function performAction(value) {
      var action,
        value,
        current;

      sequence = typeof (value) === 'object' ? value : sequence.concat(value.split('|'));

      timedAction(function (index) {
        current = sequence.shift();
        action = getAction(current);
        value = getValue(current);

        switch (action) {
          case 'countdown':
            value = parseInt(value) || 10;
            value = value > 0 ? value : 10;

            timedAction(function (index) {
              if (index === 0) {
                if (sequence.length === 0) {
                  S.Shape.switchShape(S.ShapeBuilder.letter(''));
                } else {
                  performAction(sequence);
                }
              } else {
                S.Shape.switchShape(S.ShapeBuilder.letter(index), true);
              }
            }, 1000, value, true);
            break;

          case 'rectangle':
            value = value && value.split('x');
            value = (value && value.length === 2) ? value : [maxShapeSize, maxShapeSize / 2];

            S.Shape.switchShape(S.ShapeBuilder.rectangle(Math.min(maxShapeSize, parseInt(value[0])), Math.min(maxShapeSize, parseInt(value[1]))));
            break;

          case 'circle':
            value = parseInt(value) || maxShapeSize;
            value = Math.min(value, maxShapeSize);
            S.Shape.switchShape(S.ShapeBuilder.circle(value));
            break;

          case 'time':
            var t = formatTime(new Date());

            if (sequence.length > 0) {
              S.Shape.switchShape(S.ShapeBuilder.letter(t));
            } else {
              timedAction(function () {
                t = formatTime(new Date());
                if (t !== time) {
                  time = t;
                  S.Shape.switchShape(S.ShapeBuilder.letter(time));
                }
              }, 1000);
            }
            break;

          default:
            S.Shape.switchShape(S.ShapeBuilder.letter(current[0] === cmd ? 'HacPai' : current));
            if (current === '') {
              setTimeout(function () {
                document.querySelector('.slogan').style.display = 'block';
              }, 1000 / 60);
            }
        }
      }, 2000, sequence.length);
    }

    return {
      simulate: function (action) {
        performAction(action);
      }
    };
  }());


  S.Point = function (args) {
    this.x = args.x;
    this.y = args.y;
    this.z = args.z;
    this.a = args.a;
    this.h = args.h;
  };


  S.Color = function (r, g, b, a) {
    this.r = r;
    this.g = g;
    this.b = b;
    this.a = a;
  };

  S.Color.prototype = {
    render: function () {
      return 'rgba(' + this.r + ',' + +this.g + ',' + this.b + ',' + this.a + ')';
    }
  };


  S.Dot = function (x, y) {
    this.p = new S.Point({
      x: x,
      y: y,
      z: 5,
      a: 1,
      h: 0
    });

    this.e = 0.07;
    this.s = true;

    this.c = new S.Color(255, 255, 255, this.p.a);

    this.t = this.clone();
    this.q = [];
  };

  S.Dot.prototype = {
    clone: function () {
      return new S.Point({
        x: this.x,
        y: this.y,
        z: this.z,
        a: this.a,
        h: this.h
      });
    },
    _draw: function () {
      this.c.a = this.p.a;
      S.Drawing.drawCircle(this.p, this.c);
    },
    _moveTowards: function (n) {
      var details = this.distanceTo(n, true),
        dx = details[0],
        dy = details[1],
        d = details[2],
        e = this.e * d;

      if (this.p.h === -1) {
        this.p.x = n.x;
        this.p.y = n.y;
        return true;
      }

      if (d > 1) {
        this.p.x -= ((dx / d) * e);
        this.p.y -= ((dy / d) * e);
      } else {
        if (this.p.h > 0) {
          this.p.h--;
        } else {
          return true;
        }
      }

      return false;
    },
    _update: function () {
      if (this._moveTowards(this.t)) {
        var p = this.q.shift();

        if (p) {
          this.t.x = p.x || this.p.x;
          this.t.y = p.y || this.p.y;
          this.t.z = p.z || this.p.z;
          this.t.a = p.a || this.p.a;
          this.p.h = p.h || 0;
        } else {
          if (this.s) {
            this.p.x -= Math.sin(Math.random() * 3.142);
            this.p.y -= Math.sin(Math.random() * 3.142);
          } else {
            this.move(new S.Point({
              x: this.p.x + (Math.random() * 50) - 25,
              y: this.p.y + (Math.random() * 50) - 25
            }));
          }
        }
      }

      d = this.p.a - this.t.a;
      this.p.a = Math.max(0.1, this.p.a - (d * 0.05));
      d = this.p.z - this.t.z;
      this.p.z = Math.max(1, this.p.z - (d * 0.05));
    },
    distanceTo: function (n, details) {
      var dx = this.p.x - n.x,
        dy = this.p.y - n.y,
        d = Math.sqrt(dx * dx + dy * dy);

      return details ? [dx, dy, d] : d;
    },
    move: function (p, avoidStatic) {
      if (!avoidStatic || (avoidStatic && this.distanceTo(p) > 1)) {
        this.q.push(p);
      }
    },
    render: function () {
      this._update();
      this._draw();
    }
  };


  S.ShapeBuilder = (function () {
    var gap = 13,
      shapeCanvas = document.createElement('canvas'),
      shapeContext = shapeCanvas.getContext('2d'),
      fontSize = 500,
      fontFamily = 'Avenir, Helvetica Neue, Helvetica, Arial, sans-serif';

    function fit() {
      shapeCanvas.width = Math.floor(window.innerWidth / gap) * gap;
      shapeCanvas.height = Math.floor(window.innerHeight / gap) * gap;
      shapeContext.fillStyle = 'red';
      shapeContext.textBaseline = 'middle';
      shapeContext.textAlign = 'center';
    }

    function processCanvas() {
      var pixels = shapeContext.getImageData(0, 0, shapeCanvas.width, shapeCanvas.height).data;
      dots = [],
        pixels,
        x = 0,
        y = 0,
        fx = shapeCanvas.width,
        fy = shapeCanvas.height,
        w = 0,
        h = 0;

      for (var p = 0; p < pixels.length; p += (4 * gap)) {
        if (pixels[p + 3] > 0) {
          dots.push(new S.Point({
            x: x,
            y: y
          }));

          w = x > w ? x : w;
          h = y > h ? y : h;
          fx = x < fx ? x : fx;
          fy = y < fy ? y : fy;
        }

        x += gap;

        if (x >= shapeCanvas.width) {
          x = 0;
          y += gap;
          p += gap * 4 * shapeCanvas.width;
        }
      }

      return {dots: dots, w: w + fx, h: h + fy};
    }

    function setFontSize(s) {
      shapeContext.font = 'bold ' + s + 'px ' + fontFamily;
    }

    function isNumber(n) {
      return !isNaN(parseFloat(n)) && isFinite(n);
    }

    function init() {
      fit();
      window.addEventListener('resize', fit);
    }

    // Init
    init();

    return {
      imageFile: function (url, callback) {
        var image = new Image(),
          a = S.Drawing.getArea();

        image.onload = function () {
          shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
          shapeContext.drawImage(this, 0, 0, a.h * 0.6, a.h * 0.6);
          callback(processCanvas());
        };

        image.onerror = function () {
          callback(S.ShapeBuilder.letter('What?'));
        };

        image.src = url;
      },
      circle: function (d) {
        var r = Math.max(0, d) / 2;
        shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
        shapeContext.beginPath();
        shapeContext.arc(r * gap, r * gap, r * gap, 0, 2 * Math.PI, false);
        shapeContext.fill();
        shapeContext.closePath();

        return processCanvas();
      },
      letter: function (l) {
        var s = 0;

        setFontSize(fontSize);
        s = Math.min(fontSize,
          (shapeCanvas.width / shapeContext.measureText(l).width) * 0.8 * fontSize,
          (shapeCanvas.height / fontSize) * (isNumber(l) ? 1 : 0.45) * fontSize);
        setFontSize(s);

        shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
        shapeContext.fillText(l, shapeCanvas.width / 2, shapeCanvas.height / 2);

        return processCanvas();
      },
      rectangle: function (w, h) {
        var dots = [],
          width = gap * w,
          height = gap * h;

        for (var y = 0; y < height; y += gap) {
          for (var x = 0; x < width; x += gap) {
            dots.push(new S.Point({
              x: x,
              y: y
            }));
          }
        }

        return {dots: dots, w: width, h: height};
      }
    };
  }());


  S.Shape = (function () {
    var dots = [],
      width = 0,
      height = 0,
      cx = 0,
      cy = 0;

    function compensate() {
      var a = S.Drawing.getArea();

      cx = a.w / 2 - width / 2;
      cy = a.h / 2 - height / 2;
    }

    return {
      shuffleIdle: function () {
        var a = S.Drawing.getArea();

        for (var d = 0; d < dots.length; d++) {
          if (!dots[d].s) {
            dots[d].move({
              x: Math.random() * a.w,
              y: Math.random() * a.h
            });
          }
        }
      },
      switchShape: function (n, fast) {
        var size,
          a = S.Drawing.getArea();

        width = n.w;
        height = n.h;

        compensate();

        if (n.dots.length > dots.length) {
          size = n.dots.length - dots.length;
          for (var d = 1; d <= size; d++) {
            dots.push(new S.Dot(a.w / 2, a.h / 2));
          }
        }

        var d = 0,
          i = 0;

        while (n.dots.length > 0) {
          i = Math.floor(Math.random() * n.dots.length);
          dots[d].e = fast ? 0.25 : (dots[d].s ? 0.14 : 0.11);

          if (dots[d].s) {
            dots[d].move(new S.Point({
              z: Math.random() * 20 + 10,
              a: Math.random(),
              h: 18
            }));
          } else {
            dots[d].move(new S.Point({
              z: Math.random() * 5 + 5,
              h: fast ? 18 : 30
            }));
          }

          dots[d].s = true;
          dots[d].move(new S.Point({
            x: n.dots[i].x + cx,
            y: n.dots[i].y + cy,
            a: 1,
            z: 5,
            h: 0
          }));

          n.dots = n.dots.slice(0, i).concat(n.dots.slice(i + 1));
          d++;
        }

        for (var i = d; i < dots.length; i++) {
          if (dots[i].s) {
            dots[i].move(new S.Point({
              z: Math.random() * 20 + 10,
              a: Math.random(),
              h: 20
            }));

            dots[i].s = false;
            dots[i].e = 0.04;
            dots[i].move(new S.Point({
              x: Math.random() * a.w,
              y: Math.random() * a.h,
              a: 0.3, //.4
              z: Math.random() * 4,
              h: 0
            }));
          }
        }
      },
      render: function () {
        for (var d = 0; d < dots.length; d++) {
          dots[d].render();
        }
      }
    };
  }());
  S.init();
</script>
</body>
</html>
